A bakery sells three types of muffins whose prices are as follows: 1- blueberry muffin, $2.98 2- chocolate chip muffin, $4.50 and 3- banana muffin, $9.98. You will write an application which calculates the total retail value of the sold muffins. Please check the following requirements: • Create a sentinel-controlled while loop. The flag value will be 0. Display flag value in your messages. • Display the menu and ask for the muffin number (int) (1 for blueberry one, 2 for chocolate chip one, or 3 for banana one). • Then, ask for the quantity sold for the related muffin (int). • Create a switch a statement to calculate the retail price for each muffin. • When the user terminates the application, display the total retail value (double) of all muffins. • Additionally, add an if-else statement to check whether the user only enters 1, 2, 3 or 0. If the user enters invalid input, display a message that the user can only enter 1, 2, 3